Furnace for treating ore and the like.



K. J. BBSKOW & A. RAMfiN.

FURNACE FOR TREATING ORE AND THE LIKE.

APPLICATION FILED APR.10, 1912.

Patented Mar. 24, 191i 4 SHEETS-SHEET 1.

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K. J. BBSKOW & A. R'AMEN.

FFIRNACB FOR TREATING ORE AND THE LIKE.

APPLICATION FILED APR. 10, 1912.

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FURNACE FOR. TREATING ORE AND THE LIKE.

APPLICATION FILED APR. 10, 1912'.

Patented Ma1;24,1911

4 SHEETB-SI-IEET 3.

K. J. BESKOW & A. RAMEN. FURNACE FOR TREATING ORE AND THE LIKE.

APPLICATION FILED APR. 10, 1912. 1 Q9] 1 2, Patented Mar. 24, 1914.

4 SHEETS-SHEET 4.

ATT'Y L'OLUMBIA P| J\NOGRAPH co.. WASHINGTON. D. c.

KNUT JAKOB BESKOW AND ARTHUR RAMEN, OF HELSINGBORG, SWEDEN.

FURNACE FOR TREATING ORE AND THE LIKE.

Specification of Letters Patent.

Patented Mar. 24, 1914.

Application filed April 10, 1912. Serial No. 689,933.

To all whom it may concern:

Be it known that we, KNUT JAKoB BESKOW and ARTHUR RAMiiN, chiefengineers, subjects of the King of Sweden, residing in Stidra Storgat-an19, Helsingborg, in the Kingdom of Sweden, have invented certain new anduseful Improvements in Furnaces for Treating Ore and the like, of whichthe following is a specification.

The present invention relates to such furnaces for the roasting of oresand the like, which are provided with a rotatable vertical shaft,passing through the furnace, and carrying stirring or transportingmembers serving for the stirring or transport of the material from onecompartment of the furnace to another. In furnaces of this type it isoften of great importance to utilize a part of the heat, developed inthe roasting process respectively to prevent loss of heat from thefurnace. This purpose can be obtained by arranging channels in thebrickwork forming the side-walls of the furnace and leading air or othergases through said channels. According to the present invention the saidpurpose is attained in a. favorable manner by forming vertical channelsin the corner of the brickwork of a furnace, which in known manner isformed internally with a cylindrical but externally with a rectangularor substantially rectangular or square cross section. Furthermore, bythis construction the heat of the furnace is utilized in a veryefficient manner without loss. This arrangement is connected with theadvantage, that the volume of the furnace is as completely as possibleutilized whereby the space necessary for the furnace will becomparatively small and also the building-costs of the furnace will becomparatively small. This furnace also possesses over other furnaces ofusual constructions the advantage, that the expensive tubes or pipes forthe gases, which otherwise must be arranged outside the furnace, may bedispensed with without that the furnace requires a greater space than acylindrical furnace with the same roasting surface or roasting capacity.

In order to make plain the invention, there is shown in the accompanyingdrawing by way of example, a form of construction of a furnace intendedfor the chloridizing roasting of ores, in Figure 1 in verticalsectionalong the line A-B in Fig. 3, in Fig. 2 in vertical section along theline G-D in Fig. 3, in Fig. 3 in horizontal section along the line EF inFig. l. The Figs. 4 and 5 show in vertical section, and in horizontalsection, respectively, a furnace arranged according to the presentinvention for the roasting of sulfur pyrites, or the like. Fig. 6 is aview similar to Fig. 1 showing a modified form of the furnace.

In Figs. l'3, l designates the brickwork of the furnace, which isdivided in the wellknown manner by the arches 3, 4,5, 6 into severalstages, which communicate with each other by means of openings 7, 8arranged alternately at the periphery and at the center in such a waythat the material which has been fed into the uppermost compart mentcan, by the action of the stirring and transport devices 10, mounted onthe rotatably arranged vertical shaft 9, and arranged in the well-knownmanner, he made to fall through the said openings 7 and 8 from onecompartment or division of the furnace into the division next below it,in order finally to be carried off from the lowest division through thechannel 11. According to the form of construction illustrated in Figs.l-3, which is intended for the chloridizing roasting of ores, and thelike, 0. g. purple ore (burnt pyrites), the furnace is by the arch 3divided into two, practically speaking, separate and gastightcompartments, viz., the upper compartment 2, in which the ore, or, as itmay be, the mixture of chlorids and ore, is heated by hot combustiongases (smoky gases) introduced therein, while the chloridizing roastingis carried on in the chloridizing compartment, viz., the compartment ofthe furnace lying under the said arch and divided by the arches 4, 5, 6into several stages or divisions, from which compartment the gasesgenerated in the chloridizing process are carried off, separately fromthe smoky gases serving for the heating of the material. In order toprevent gases from the heating compartment streaming into thechloridizing compartment or vice versa, the channels 7 in the arch 3 arein the wellknown manner provided with automatic devices acting in such aWay that the ore fed into them is dammed up in the said channels, thusforming a gas-tightpartition between the heating compartment and thechloridizing compartment, but is continually (or periodically) carrieddown into the lower compartment, fresh ore being the while introduced atthe same rate into the channels, so that the latter are always filled.Such a damming up of the ore can, as shown in the drawing, be broughtabout 6. g. by arranging a ledge 12 at some distance under the lowermouth of the channels 7, whereby the ore is dammed up in the channelwhile ore is carried down from the said ledge into the chloridizingcompartment by a scraper 13, Which scraper is mounted on the arm 10carried by the rotating shaft 9 which also carries the stirring ortransporting devices. The ore is admit-ted into the heating compartmentthrough drums 15 by means of suitable devices from a hopper or chargingfunnel (not shown). Through the channels 16, 16, 17, 18, 19 arranged inthe corners of the brickwork, the gases are admitted into or carried offfrom the furnace or the different compartments of the furnace, in thefollowing manner: Through the channel 16, which communicates with thehearth 20, the smoky gases intended for the heating of the ore are firstconveyed through the arch 5 which is formed into a mutlie, andtherefrom'thro-ugh the vertical channel 18 to the heating compartment 2,where they give off heat to the material to be roasted, and are carriedofl from the said compartment, through the vertical channel 16 arrangedin the opposite corner, from which channel 16 they are carried oilthrough the duct 21 to the chimney. If the path taken by these gases, islooked upon it will be evident that the heat contained in said gases isutilized to the best possible extent, as in their passage through thechannels 16, 18, 16 they help to keep the brick Work surrounding thechloridizing compartment hot, or, as the case may be, to keep it fromcooling, while at the same time heat is also given ofi through the arch5 to the chloridizing compartment, so that in this way the temperaturein it can be regulated at will. Through the channels 17, 19 arranged inthe two other corners of the brickwork, the acid gases generated in thechloridizing compartment are carried off, for which purpose the saidchannels communicate through openings 23, which can be closed by dampersarranged in them, with the different stages of the chloridizingcompartment. The channel 19 communicates through the channel 24 arrangedin the floor of the furnace with the discharge or exhaust channel 25common to both the channels 19 and 17. The air requisite for thechloridizing process is introduced into the chloridizing compartmenteither directly from outside through dampers or valves 32 arranged inthe brickwork; or one may, for the same purpose, arrange verticalchannels in the corner of the brickwork close to the channels 16, 17,18, 19, in the same way as the channels 26 shown in Fig. 5, whereby isattained the advantage that the air is heated by the action of the gasesstreaming through the said channels. 29 designates beams serving for theanchoring of the masonry. This form of construction of the furnace canalso be used with advantage for the roasting of lowper-cent. pyritessuch as sulfur pyrites, magnetic pyrites, etc., in the roasting of whichit is of importance both to introduce a good deal of heat for theinitiation of the roasting process, and also to see that the losses ofheat in the roasting compartment proper be as small as possible. In theroasting of ores of this nature the heating of the material is likewisecarried on in the upper compartment 2, while the oxidizing roasting iscarried on in the lower compartment, and the gases thereby generated,just as in the chloridizing roasting, are carried oil separately fromthe gases serving for the hcatlng.

It is obvious that the form of construction shown in Figs. 13 may bevaried in the way illustrated by Fig. 6, 2'. 0., that the muffle in thearch 5 is excluded. In this case the gases are conveyed from the hearth20 directly up to the heating compartment 2 through a channel 16 in thesame corner as the hearth 20. From compartment 2 the smoky gases areconveyed through a channel 18 in the opposite corner down to an exhaustchannel 28 for smoky gases, ar ranged in the ground.

The furnace shown in Figs. a: and 5 is intended for the roasting ofhigh-per-cent. sulfur pyrites, in which a comparatively great generationof heat takes place, which heat can be utilized by this invention to agreater extent than otherwise. This furnace is not, like the onedescribed above, divided into compartments separate from each other, butis constructed in one single compartment divided by arches into severalstages or divisions communicating with each other. The gases generatedin the furnace are carried off from the uppermost stage through thechannels 27 to the common exhaust channel 28 placed under the floor ofthe furnace. The air is introduced into the furnace direct from outside,0. g. through the so-called working openings 33. In order to be able toutilize the heat of the furnace there are arranged in the brickwork anynumber of vertical channels 20, through which air is conducted. Theheated air escaping from the said channels may be suitably used for thedrying of the pyrites, before it is fed into the furnace. Besides theabove mentioned advantage of a cheaper anchoring and cheaperconstruction of the furnace as a whole, the present invention, whenapplied to pyrites furnaces, is also attended by the advantage that itdoes away with the otherwise necessary expensive insulated iron pipesfor carrying off the roasting gases from the upper part of the furnace;these gases being new carried off in stead through the channels formedin the brickwork which channels, if found necessary, may be lined,beside which, as stated above, an advantageous utilization of the heatfrom the furnace through the arrangement of air channels can beobtained.

Having thus described our invention, we declare, that what we claimis 1. Roasting furnace divided in several superposed divisions andprovided with a central vertical shaft carrying stirring devices, thebrickwork of the furnace having internally a cylindrical but externallya rectangular cross-section, vertical channels be ing arranged in thecorners of the brickwork, said channels communicating with the interiorand adapted for leading off gases generated in the furnace.

2. Roasting furnace divided in several superposed divisions and providedwith a central, vertical shaft carrying stirring devices the brickworkof the furnace having internally a cylindrical but externally arectangular cross-section, vertical channels be ing arranged in thecorners of the brickwork, said channels communicating with the interiorand adapted for leading off gases generated in the furnace, a muflieformed in an intermediate bottom of the furnace, said mufllecommunicating with a channel arranged in one corner of the furnace, thislatter channel communicating with the upper compartment of the furnace,said upper compartment communicating with an exhaust for gases throughthe in termediation of a vertical channel arranged in one corner of thefurnace.

In witness whereof we have hereunto set our hands in presence of twowitnesses.

KNUT JAKOB BESKOXV. ARTHUR RAMEN. Witnesses:

E1110 A. MoLLER, HEMMING MAMOS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

